Report in UK newspaper( The Independent) today suggets that the terrorists knew eough anout AF1 trans codes and AF1 produrwa to convince ATC.....hence evacuation of White House.
Here in the UK there is a site for pro flyers which gives details of all the flights of our "Queens Flight"......ie Royals, goverment ministers et al..........e-mail for details if you want ...... are we talking stoopid here or what ?
regards
Peterj